Revenue (Tables)

6 Months Ended

Jun. 30, 2020

Revenue from Contract with Customer [Abstract]

Schedule of Disaggregation of Revenue

We disaggregate our revenue from customers by type of service and by geographic region as we believe it best depicts how the nature, amount, timing and uncertainty of our revenue and cash flows are affected by economic factors. See details in the tables below.

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2020		2019		2020		2019
Environmental Solutions
Product sales	$	21,400	$	24,890	$	43,161	$	47,402
Construction contracts	15,347		11,900		30,194		46,207
Services	1,115		160		1,172		1,724
Total Environmental Solutions	37,862		36,950		74,527		95,333
Maintenance and Technical Services
Services	95,283		83,986		223,249		188,861
Total Maintenance and Technical Services	95,283		83,986		223,249		188,861
Total revenue	$	133,145	$	120,936	$	297,776	$	284,194

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2020		2019		2020		2019
Environmental Solutions
United States	$	37,651	$	36,950	$	73,681	$	95,333
Foreign	211		—		846		—
Total Environmental Solutions	37,862		36,950		74,527		95,333
Maintenance and Technical Services
United States	95,283		83,986		223,249		188,861
Total Maintenance and Technical Services	95,283		83,986		223,249		188,861
Total revenue	$	133,145	$	120,936	$	297,776	$	284,194